package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Slf4j
@Component
@Aspect
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&&@annotation(com.sky.annotation.AutoFill)")
    public void  autoFillAspect() {}

    /**
     * 前置通知，在通知中进行公共字段赋值
     */
    @Before("autoFillAspect()")
    public  void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段填充");
       //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = annotation.value();
      //获取到当前被拦截方法的参数
        Object[] args = joinPoint.getArgs();
        if(args == null && args.length == 0) {
            return;
        }
        Object arg = args[0];
        //准备赋值的数据
        LocalDateTime localDateTime = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT) {
           //为4个字段赋值
            try {
                Method setCreateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUSER = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUSER = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setCreateTime.invoke(arg,localDateTime);
                setCreateUSER.invoke(arg,currentId);
                setUpdateTime.invoke(arg,localDateTime);
                setUpdateUSER.invoke(arg,currentId);
            } catch (Exception e) {
              e.printStackTrace();
            }
        }else if(operationType == OperationType.UPDATE) {
              //为2个字段赋值
            try {
                Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUSER = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(arg,localDateTime);
                setUpdateUSER.invoke(arg,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}
